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Pseudo-Spectral Damping Reduction Factors for the Himalayan Region Considering Recorded Ground-Motion Data

机译：考虑记录的地面运动数据的喜马拉雅地区的伪谱阻尼减小因子

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摘要

Ground-motion prediction equations that are used to predict acceleration values are generally developed for a 5% viscous damping ratio. Special structures and structures that use damping devices may have damping ratios other than the conventionally used ratio of 5%. Hence, for such structures, the intensity measures predicted by conventional ground-motion prediction equations need to be converted to a particular level of damping using a damping reduction factor (DRF). DRF is the ratio of the spectral ordinate at 5% damping to the ordinate at a defined level of damping. In this study, the DRF has been defined using the spectral ordinate of pseudo-spectral acceleration and the effect of factors such as the duration of ground motion, magnitude, hypocenter distance, site classification, damping, and period are studied. In this study, an attempt has also been made to develop an empirical model for the DRF that is specifically applicable to the Himalayan region in terms of these predictor variables. A recorded earthquake with 410 horizontal motions was used, with data characterized by magnitudes ranging from 4 to 7.8 and hypocentral distances up to 520 km. The damping was varied from 0.5–30% and the period range considered was 0.02 to 10 s. The proposed model was compared and found to coincide well with models in the existing literature. The proposed model can be used to compute the DRF at any specific period, for any given value of predictor variables.
机译：通常针对5％的粘性阻尼比开发用于预测加速度值的地面运动预测方程式。特殊结构和使用阻尼装置的结构的阻尼比可能不同于常规使用的5％。因此，对于这样的结构，需要将传统的地面运动预测方程式预测的强度测量值使用减震系数（DRF）转换为特定的减震水平。 DRF是在5％阻尼下的光谱纵坐标与在定义的阻尼水平下的纵坐标之比。在这项研究中，已使用伪光谱加速度的光谱坐标定义了DRF，并研究了诸如地震动持续时间，震级，震中距离，场地分类，阻尼和周期等因素的影响。在这项研究中，还尝试开发针对DRF的经验模型，这些模型就这些预测变量而言特别适用于喜马拉雅地区。使用了410次水平运动记录的地震，其数据特征是震级范围为4到7.8，震中距离最大为520 km。阻尼从0.5％到30％不等，考虑的周期范围为0.02到10 s。对提出的模型进行了比较，发现与现有文献中的模型非常吻合。对于任何给定的预测变量值，建议的模型均可用于在任何特定时间段计算DRF。

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